Brush-mount for electric motors.



J. BERG-I.

BRUSH MOUNT FOR ELECTRIC MOTORS. APPLICATION FILED JAN.27,1917.

Patented May '14, 1918.

JOSEPH BERG, or CHICAGO, ILLINOIS, ASSIGNOR To STEWART-WARNER SBEEDOMETER 4 CORPORATION, or CHICAGO, ILLINOIS, A CORPORATION UNITED STATES PAT NToFEIoE.

0F VIRGINIA.

BRUSH-MOUNT FOR ELECTRIC Moro'Rs.

To all whom it may concern:

Be it known that I, JosErH BERG, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented new and useful Improvements in Brush-Mounts for Electric Motors, of which the following is a specification, reference being had to the accompanying drawings, forming a part thereof.

The purpose of this invention is to provide means for mounting thebrushes of a small electric motor, or generator, which shall insure rapidity and correctness in assembling, dispensing with the necessity for initial or subsequent adjustment and which shall at the same time be economical in manufacture. The invention consists in the features and elements of construction and their combination described and shown in the drawings as indicated by the claims.

In the drawings:-

Figure 1 is a side elevation of a portion of' a motor equipped'with brush mounting devices embodying this invention.

Fig. 2 is a section taken as indicated at line 2-2 on Fig. 1. 7

Fig. 3 is a detail section on a larger scale taken as indicated at line 3-3 on Fig. 1.

Fig. 4 is a detail section taken as indiholders,.3, as illustrated, are of rectangular cross-section, and the ooves, 2 are also of this form so as to fit em snugly affording the surface, 2, at the bottomof the groove, and the surfaces, 2 2 transverseto 2, and adjacent to the lateral surfaces, 3 of the holder, for lodgment and positioning of the holder, but, obviously, the brush holders" might beof cylindrical form or any other suitable shape, in which case the shape of the grooves, 2, would be suitably altered to fit them.

The annular frame, 2, is preferably formed with inwardly projecting lugs, 2*, in which the grooves, 2", are continued toward the Specification of Letters Patent.

cated at line 44- on Fig. 2, but with the p The frame, 2, is

Patented Ma 14, 1918.

Application filed January 27, 1917. serial No. 144,339.

. axis of the motor,-so that said grooves may have sufiicient length for retaining the brush holders in correct alinement. From the bot: tom of each groove, 2, an aperture, 2", leads .through the frame, 2, and is fitted with an insulating bushing, 5, into which a bolt, 6,

is driven tight. Preferably the bolt, 6, is.

formed with a step or'shoulder at 6, just under its head, and the circumference of I stood that, if it be preferred tomake the holder, 3, of non-conducting material, the

spring member, 8, will serve as an electric connection between the bolt, 6, and the brush,

1; and that, if. the 'brushholder, 3,is metallic and thus adapted to carry the current, the pressure of the spring, 8, will insure adequate contact between the brush, 1, and said holder, 3. Y

' Within the holder, 3, is pocketed a coilspring, 9, reacting between the bolt, 6, and

the outer end of the brush, 1, and lpr ssing the latter against the commutator, in the to be more and more protruded from the holder, 3, as its end, in contact with the com usual manner, This spring causes thebrush' in position; actin as a binding post for the conductor, 10, an electrically connecting the conductor,.10, with the brush, 1, without such extra wlring between these parts as is re:

'quired in many other constructions. It will be evident that when the frame, 2, is accu-. rately machined, the brushes, 1, are bound to be assembled in correct relation to the commutator, A, because the brush holders, 3, can only be assembled in the grooves, 2*,in

' between them, completing the assembly of this part of the motor.

I claim: Y j 1. The combination of a frame and a hollow brush holder thereon, the frame having a seat for the holder comprising a surface upon which the latter is lodged and a surface transverse thereto, adjacent to the lateral surface of the holder, together with a securing bolt passing through the seat and the holder, transversely of. the lodgment surface, the said transverse surface engaging the holder to-prevent pivotal movement upon said bolt, and a brush in said holder.

2. The combination of a frame member havlng a channel, a socket member lodged therein, a brush slidably carried in such socket, and a bolt passing through the frame and socket transversely of the bottom of the channel for holdin the socket therein.

.3. The combinatlon of a frame member having a1channel,-a socket member lodged therein, a brush slidably carried in such I socket, andfa. bolt passing through the frame and sockettransversely of the bottom of the channel for holding the socket therein, means insulating the .bolt and the socket from the frame, means for attaching a conductor to the bolt, and a spring contact member secured by said bolt with a yielding portion in contact with the brush in the socket.

4:- The combination of a frame member having a channel, a socket member lodged therein, a brush slidably carried in such socket, a bolt passing through the frame and socket transversely of the bottom of the channel .for holding the socket in place, means Insulating the bolt and the socket from the frame, means for attaching a conductor t@ the bolt, said socket having an opening at one side and a spring contactthe first-mentioned seat, the said transverse surface thus acting to prevent pivotal movement of the tube upon said bolt.

6. The combination of a frame member and a tubular brush holder ofnoncircular cross-section secured thereto, said holder having a slit at one side, a yielding contact member adapted to engage the brush in the holder through such slit and a single securing bolt in the frame passing through'both the tubular holder and the yielding contact member for retaining said part on the frame.-

7. The combination of a frame member and a tubular brush holder of non-circular cross-section secured thereto, said holder having a slit at one side, a yielding contact member adapted to engage the brush in the holder through such slit and a single securing bolt in the frame passing through both the tubular holder and the ylelding contact member for retaining said part on theframe, said bolt being fitted with two nuts, one of which is adapted to clamp the brush holder and contact member to the frame, the other 113111117 serving to secure a conductor wire to the 8. 'The combination of a frame, a tubula brush holder thereon, a bolt passing transversely through said tubular holder for securing it to the frame, a brush slidably carried in the holder, and a spring pocketed therein, so as to react between said brush and the said securing bolt.

In testimony whereof, I have hereunto set my hand at Chicago, this 18 day of January, 1917.

\ JOSEPH BERG. 

